Limited Propagation of Lattice Distortion in Trilayer Langmuir鈥揃lodgett Films: Correlation with Mesoscopic Structure

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• 作者：Sophie Cantin ; Fran莽oise Perrot ; Philippe Fontaine ; Michel Goldmann
• 刊名：Langmuir
• 出版年：2013
• 出版时间：September 3, 2013
• 年：2013
• 卷：29
• 期：35
• 页码：11046-11054
• 全文大小：494K
• 年卷期：v.29,no.35(September 3, 2013)
• ISSN：1520-5827

文摘

The structure of trilayer Langmuir鈥揃lodgett (LB) films on oxidized silicon wafers has been investigated using grazing incidence X-ray diffraction at various incidence angles and atomic force microscopy (AFM). These films are formed by two behenic acid (BA) layers and a third monolayer of amphiphilic molecules having different architectures. These molecules have the same polar head and differ from each other by the chain, either saturated or unsaturated hydrogenated or semi-fluorinated. The structure of the first BA monolayer appears as unchanged in all cases, whereas a condensation of the second BA monolayer is evidenced when the third layer is not formed with the saturated hydrogenated chain. We interpret this condensation as resulting from the mismatch between the lattices of the second BA layer and the external monolayer, possibly associated with the formation of a new monolayer鈥揳ir interface creating line tension effects. Line tension estimation has also been made from the size of the holes observed in the different LB films.